Service Workers are also in Firefox Nightly right now, but are hidden behind an about:config flag until the feature is fully baked. https://developer.mozilla.o

Service Workers are also in Firefox Nightly right now, but are hidden behind an about:config flag until the feature is fully baked. https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API#Browser_compatibility https://developer.mozilla.org/en-US/docs/Web/API/Service_Wor... http://caniuse.com/serviceworkers http://caniuse.com/serviceworkers There's also the Application Cache, which has been fully supported in the stable versions for a while now. https://developer.mozilla.org/en-US/docs/Web/HTML/Using_the_application_cache https://developer.mozilla.org/en-US/docs/Web/HTML/Using_the_... http://caniuse.com/offline-apps http://caniuse.com/offline-apps And of course, FF for Android has an "Add to Homescreen" button too.